The term “speculative fiction” was introduced some time in the 1960s by younger authors that considered “science fiction” to be too restrictive. Fair enough, the genre is certainly fuzzy enough around the edges. However, it never really caught on; possibly it sounded a bit too academically precise. A web magazine that still carries the banner of speculative fiction is Strange Horizons. Fiction, to be sure, but also columns, analyses, art and poetry and with sometimes rather oblique connections to speculative fiction per se, i e it is rather eclectic. So am I, so I certainly don't mind. Go read!